Checks and Balances: The Three Branches of the American Government
Psychologists and Their Theories For Students
Early Civilizations in the Americas
The Sixties in America Reference Library
Space Exploration Reference Library
Encyclopedia of Espionage, Intelligence and Security
Encyclopedia of Children and Childhood: In History and Society
Encyclopedia of Irish History and Culture
U.S. Immigration and Migration Reference Library
Encyclopedia of Russian History
Chemistry: Foundations and Applications
War in the Persian Gulf Reference Library: From Operation Desert Storm to Operation Iraqi Freedom
Encyclopedia of World Biography: 2010 Supplement
The Gale Encyclopedia of the Unusual and Unexplained